macOS High Sierra will deliver new video and graphics technologies that will lay the groundwork for even more improvements to macOS down the line, according to Apple. The big additions in High Sierra include Apple File System (APFS), support for High-Efficiency Video Coding (HEVC), and an all-new version of Metal - simply called Metal 2 - which will allow Apple's advanced graphics tech to power even more Mac apps, including machine learning and VR-based content.